Update git submodules

* Update docs/submodules/sdnvpn from branch 'master'
  - Nominating Dimitrios Tsiolakis as SDNVPN committer

    I would like to nominate Dimitrios Tsiolakis as a SDNVPN committer as he
    is working with SDNVPN project for several months and looking to BGPVPN
    tempest testsuite and other CI issues on daily basis.

    Here are his contributions: https://gerrit.opnfv.org/gerrit/#/q/owner:%22Dimitris+Tsiolakis+%253Cdmts%2540intracom-telecom.com%253E%22+project:sdnvpn

    Change-Id: I093df6949993888b137430d384aba0cd1bcdd33c
    Signed-off-by: Periyasamy Palanisamy <periyasamy.palanisamy@ericsson.com>

diff --git a/docs/submodules/sdnvpn b/docs/submodules/sdnvpn
index 34de2b9..223484a 160000 (submodule)
--- a/docs/submodules/sdnvpn
+++ b/docs/submodules/sdnvpn
@@ -1 +1 @@
-Subproject commit 34de2b9cd3c4d6306e772549b3ad7ed089a8f76b
+Subproject commit 223484a44ea3d59c7e8a5e788fecc7f0545b0331